Document Type : Original Article
Authors
1 endodontic department,, Faculty of Dental Medicine for Girls, Al –Azhar University,nasr city, Cairo
2 Professor of Endodontics, Endodontic Department, Faculty of Dental Medicine for Girls, Al –Azhar University
3 Associate Professor of Endodontics, Endodontic Department, Faculty of Dental Medicine for Girls, Al –Azhar University.
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